Electric regulation.



J. L. CREVELING.

ELECTRIC REGULATION.

APPLICATION HLEDA nsc.29,1910.,

Patnted Jan. 25,v 1916.

WITNESSES INVENTOI? THE COLUMBIA PLANOGRAPH c0., WASHINGTON, n. c.

UNITED sTATEs PATENT ora ion.

JOHN L. CREVELI NG,. OF NEW YORK, N. Y., ASSIGNOR TO SAFETY CAR. HEATINGAND LIGHTING COMPANY, A CORPORATION OF NEW JERSEY.

ELECTRIC REGULATION.

Specification of Letters Patent. i Patented Ja11.25, 1916.

. Application filed December 29, 1910. Serial No. 599,872.

.To all whom it may concern Be it known that 1, JOHN L. CREVELING, aresident of the city, county, and State of New York, have inventedcertain new and useful Improvements in Electric Regulation, as set forthinthe annexed specification and drawing forming a part thereof.

My invention pertains to that class of electric regulation wherein it isdesired to automatically govern a generator in a predetermined manner. j

As myinvention is particularly applicable to those systems wherein agenerator, driven at variable speed isused to charge a storage batteryand operate lamps or other translatingdevices, it .will be describedwith reference to such a system.

Figure l is a diagrammatic representation of one type of such systemembodying the essentials of my invention. Fig. 2 is a modified form ofsystem embodying the essentials of'my invention.

In the drawing 1 represents-a. dynamo or generator PI'OVlClEdiWlth theusual field coil 2, having in series therewith a field controllingelement 3,-in this instance indicated as a rheostat of the carbon pilevariety.

From the dyanmo 1, the ositive lead 4 is carried to the positive si e ofthe storage battery 5 and lamps or translating devices 6, both of whichhave their negative termi- 4 nals carried to the negative lead 7 of thewhich will hereinafter more plainly appear.

Pivoted lever 10, controlling the element 3 is normally drawnin anupward direction as by ad ustable spr ng 11in such manner as to tend todecrease the resistance of the 1 carbon pile3 and increase the voltageof the generator. 'lhelever 10 is provided at one extremity with thecore of magnetic material l 12 surrounded, by the solenoid 13 which,

when energized, tends to pull the core 12 downwardly and lncrease thereslstance 3 to lower the voltage upon the generator.

In Fig. 1 the solenoid, 13 is'shown as hav-f ing in series therewith aresistance liwhich may be either fixed or adjustable as desired 3- thevoltage of the generator.

and the said coil 13 is placed in shunt across that portion of thesystem, the voltage upon which it is desiredto usei'or the regulatingfactor of the generator. In this instance the said solenoid is shown asin shunt'across the generator main circuit. 15 is acarbon pile or othersuitable variable resistance in spring 17 against the. adjustablecontact screw or stop 18. The lever 16 is provided at its end with acore, 19, of magnetic material, surrounded by the solenoid 8 in suchmanner that energization of the said solenoid tends to lift the core 19against the ac tion of spring 17 and compress the carbon pile 15 andreduce the resistance thereof in such manner as to increase the currentin the coil 13.

In Fig. 2, the solenoid 13 is connected across that portion of thesystem with respect to which it is desired to govern the generatorvoltage and as shown, is connected across the main circuit and having inseries therewith the variable resistance 20,; indicated as of the carbonpile variety. The resistance 20 is varied in the same manner as,

the resistance 15 in. Fig. 1, upon energization of the solenoid 9.

A practical operation of my improved system is substantially as follows:In the system shown in Fig. 1 if the generator be running at such speedas to be capable ofv charging the storage battery and operating thelamps or translating devices, current will flow through the field 2 andthe generator voltage may beregulated in a well known manner by propervariation of resistance 3. The current flowing through the lead 1 to thestorage battery will pass through the solenoid 8 and tend to lift thesame against the action of spring 17. Cur rent will also flow throughresistance 14: and solenoid 13 and tend to depress the lever 10 againstthe-action of spring 11 in such manner as to increasethe resistance 3and lower I so adjust the spring 11 that whenthe resistance 15 i bechosen to have the same when the lever 16 is held against the stop 18,that any fur ther increase in voltage acrossthecircnitin shunt to whichthe solenoid 13 is placed, will cause the same to draw the core 12downwardly and prevent the generator voltage increasing above thispoint. I now so adjust the spring 17 that whenthe desired maximumcurrent flowing to the storage battery through the coil 8 is reached,any increase above this amount will raise the lever 16 in such manner asto decrease the resistance 15, and thus, decrease the total resistancein series with thewinding 1'3 and increase the strength thereof for agiven voltage across the circuit to which it is placed in shuntandtherefore the voltage which the coil 13 will tend to-hold constantacross the circuit in shunt to which it is placed, will be variedinaccordance with thefcurrent in the coil 8. In the system as shown in F 2I so adjust the spring 11 and the screw 18 that when the lever 16 isheld upon the screw 18 andthe desired voltage is reached across thatportion of the cir cuit-in-shuntto which the coi'lf13is placed, anyfurther increase in voltage will cause thecore l2to be drawn downwardlyin such manner as-toincrease the resistance 3 and tend to prevent thegenerator voltage rising above that point. I now so'adjust the springlTthat when themaximum current desired, as: the output forthe generatoris reached, any increasein this current flowing in the solenoid 9 willraise thelever 16 so as-to decrease the resistance 20 in series with thecoil 13 and so strengthen the same that it will tend to hold the lowervoltage constant across that portion of the circuit to which it isplaced in shunt.

From the foregoing, it will be obvious that I have produced meansforregulating a generator, to hold its voltage constant throughout speedchanges or other tendencies to cause variations in generator voltage andhave provided means whereby the voltage to be held constant throughthese speed changes is modified in accordance with the current deliveredin a circuit in the systom.

1 do not wish in any way to limit myself to the exact details ofconstruction and operation above set forth as a merediagrammaticrepresentation of oneform of employment of my invention, as widedeparture may be made within the scope of said invention and as is setforth in the following claims 1. Means for regulating a generatorcomprehending a' compressible regulating element; voltage responsivemeans for controlling the same; and means, including a compressibleresistance, for varying the current in the said voltage responsivemeansdependprehending a regulating element; voltage responsive means foractuating the same; a compressible regulating element for aflecting thecurrent 1n said voltage responsive -means, and means for controlling thesame responsive to current fluctuations beyond a vpredetermined limitonly. I

3. Means for regulating a generator comarehendin a regulator thereforcom irisin b o 7 b compressible means and electro-responsive meanstending to hold the generator voltage constant; combined with means formodifying the current in said regulating means depending upon thecurrent beyond a predetermined value only flowing in a circuitsupplied'by said generator.

4;. The combination with a generator and a supply circuit, of aregulator for the generator responsive to voltage fluctuations acrossthe supply circuit, and a controllerincluding a series coil for varyingthe action of the regulator by. current above-a predetermined limitsupplied by said generator.

5. -Means for regulating a generator comprehending a voltage regulatoroperable above a predetermined generator output, means for electricallyvarying the adjustment of said voltage regulator, and current operated.means governing said last mentionedmeans and being inoperative below acertain predetermined current.

(5. The combination with a source of variable electro-motive force and acircuit supplied thereby, ofmeans for controlling said electro-motiveforce in response to voltage fluctuations, and means for adjusting thecurrent in the voltage responsive means including a coil affected bycurrent fluctuations in said circuit above a predetermined value only.

7. The combination with a source of electro-motive force tendingto vary;voltage operated means for holding said electromotive forcesubstantially constant throughout tendencies to vary; and meansaffecting current responsive means for determining the value ofelectro-motive force to be held constant and affected only by currentfluctuations beyond a predetermined value.

8. T he combination with a generator driven at variable speeds; a coiland variable resistance fol-holding the voltage thereof substantiallyconstant throughout speed changes of resistance varying means foradjusting the standard voltage to be held constant at such values as toprevent the current supplied by the generator exceeding a predeterminedlimit.

9. The combination with a generator driven-at variable speeds; a supplycircuit; a coil operated variable-resistance for regulating thegenerator to hold the voltage exceeding a predetermined value, and saidacross the supply circuit constant throughad usting means beinginoperative when the out speed changes; of a coil operated var1 currentin said circuit is below this value.

able resistance for adjusting the voltage to JOHN L. CREVELING. be heldconstant across the supply circuit, Witnesses:

whereby the current in said circuit, due to CHAS. MoG. CHAPMAN,

the voltage held constant, is prevented from ANITA E. Tums.

Copies of this patent may be obtained for five-cents each, by addressingthe "Commissioner of Patents. Washington, D. G."

